Odd Magneto-Optical Linear Dichroism in a Magnetophotonic Crystal

TL;DR

This paper reports the discovery of an odd magneto-optical linear dichroism effect in nanostructured magnetophotonic crystals, showing polarization-dependent light modulation based on magnetization direction.

Contribution

It introduces a novel magneto-optical effect arising from polarization-dependent mode Q-factors in nanostructures, demonstrated in a magnetophotonic crystal with cavity modes.

Findings

Magneto-optical intensity modulation reaches up to 6%.

Effect observed at specific polarization and incidence angles.

Demonstrates polarization-dependent mode Q-factor influence.

Abstract

The phenomena of magneto-optical polarization rotation and circular magnetic dichroism are well known in the Faraday configuration. We present another effect, an odd magneto-optical linear dichroism, arising in nanostructures with polarization-dependent mode Q-factors. It reveals itself as the magneto-optical modulation of light intensity for the two opposite magnetization directions in the Faraday configuration. The effect was demonstrated on a magnetophotonic crystal with a cavity mode, the polarization-dependent Q-factor of which is due to oblique incidence. For a polarization angle of 60{\deg} (or 120{\deg}) and an angle of incidence around 60{\deg}, the magneto-optical intensity modulation maximizes and reaches 6%.